KAO Corporation Water-in-Oil Emulsion UV Cosmetic Patent Application
Summary
KAO Corporation filed patent application US20260108432A1 on April 23, 2026, covering a water-in-oil emulsified cosmetic with UV scattering agents, amphiphilic substances, and specific aqueous-phase components. The application, originally filed on February 21, 2024 under Application No. 19154018, designates dimethicone-treated zinc oxide microparticles as a key component with a mass ratio threshold of 0.38 or more relative to total UV scattering agent content. Inventors Shi Chen and Mio Ishita are credited for the formulation specifying a surface tension below 0.0728 N/m and aqueous-phase content of 16 mass percent or more.
“A water-in-oil emulsified cosmetic containing the following components (A), (B), and (C): (A) an UV scattering agent having a hydrophobicity degree of 73% or less in accordance with methanol titration; (B) an amphiphilic substance which is solid at 25° C.; and (C) an aqueous-phase component.”
About this source
USPTO classification A61K covers pharmaceutical preparations: formulations, dosage forms, combination therapies, delivery systems, and the vehicles that carry active ingredients. Every newly published application in A61K lands in this feed, around 245 a month. Applications publish 18 months after filing, so this feed reveals what pharma formulators at major sponsors and generics were working on in the prior year and a half. Watch this if you compete in drug formulation, file freedom-to-operate analyses, scout competitive drug products before clinical readouts, or follow novel delivery platforms like nanoparticles, lipid carriers, and long-acting injectables.
What changed
KAO Corporation obtained publication of patent application US20260108432A1 for a water-in-oil emulsified UV cosmetic formulation. The application claims priority from a February 2024 filing and specifies component requirements including dimethicone-treated zinc oxide microparticles (A1) at a mass ratio of 0.38 or more to total UV scattering agent (A), amphiphilic solid substances at 25°C, and an aqueous phase with surface tension below 0.0728 N/m at 16 mass percent or more. CPC classifications span A61K 8/064 through A61Q 17/04 covering cosmeceutical preparations.
Affected parties in the cosmetics and personal care industry should note the specific technical thresholds disclosed: zinc oxide microparticle treatment requirements, emulsion stability parameters through surface tension specifications, and minimum aqueous-phase loading. Competitors developing similar UV-protective water-in-oil emulsions should review the claims for potential freedom-to-operate considerations once the application proceeds toward grant.
Archived snapshot
Apr 24, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
WATER-IN-OIL EMULSION COSMETIC
Application US20260108432A1 Kind: A1 Apr 23, 2026
Assignee
KAO CORPORATION
Inventors
Shi CHEN, Mio ISHITA
Abstract
A water-in-oil emulsified cosmetic containing the following components (A), (B), and (C): (A) an UV scattering agent having a hydrophobicity degree of 73% or less in accordance with methanol titration; (B) an amphiphilic substance which is solid at 25° C.; and (C) an aqueous-phase component. The component (A) contains dimethicone-treated zinc oxide microparticles (A1), in which a mass ratio of a content of the component (A1) to a content of the component (A) [component (A1)/component (A)] is 0.38 or more, the component (C) has a surface tension of less than 0.0728 N/m, and a content of the component (C) is 16 mass % or more.
CPC Classifications
A61K 8/064 A61K 8/29 A61K 8/44 A61K 8/60 A61K 8/891 A61Q 17/04
Filing Date
2024-02-21
Application No.
19154018
Parties
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